Boiler



' April 17, 1.1128.

G. T. LADD BOILER Filed Sept. 29. 1921 6 Sheets-Sheet 4 ma??? f5 April 17, 1928. 1,666,659

G. T. LADD BOILER Filed SeP- 29.l 1921 6 Sheets-Sheet 5 y faz FIB.4. Lw

//V VEN 70A 1.3mm .W w11 Wl TNESSES t www April 17, 192s. 1,666,659

G. T. LADD BOILER F1166 sept. 29. 1621 6 sneetssheet 6 El r3 KWMM M um Patented Apr. 17, 192s.

UNITED STATES PATENT OFFICE.

GEORGE T. LADD, OF PITTSBURGH, PEYNSYLVANIA, ASSIGNOR TO LADD WATER TUBE BOIL'ER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

BOILER.

Application filed September 29, 1921. Serial No. 504,086.

This invention relates to boilers, and one object olI the invention is to improve the construction of a boiler of the straddle type, which is suspended from a framework, by providing novel means to maintain the lower drums of the boiler spread apart in proper spaced relation.

Another object of my invention is to pro ride supporting means for the arch and bridge wall construction, that may be carried by the supporting framework of the boiler.

ln the accon'ipanying drawings forming a part oi' this specification, Fig. 1 is a view partly in section and partly in elevation of a boiler installation embodying the improvements described herein; Figs. 2 and 2 show respectively the upper and lower portions of a sectional elevation, the plane oi section being indicated by the line Il--L Fig. 1; Fig. 3 is a sectional detail view on an enlarged scale showing the top of a portion of the fire box, the bridge wall and the means employed ior supporting said members; Figs. 4 and 5 are a side elevation and plan respectively, of portions of the steel trame and the beam supporting the bridge wall and lire box arch; Fig. 6 is a sectional elevation showing modifications in the generating units; Figs. 7, 8 and 9 are sectional detail views, the planes of section being indicated by the lines Vil- VIL VIII-JUN in Fig. 3 and the lines lX-IX in Fig.

1n the practice otl the invention two heating or generating units are employed. each of said units consisting ol'I upper drums i, lower drums 2, and banks Il, Li. 5, oie connecting tubes. These units are so installed as lo torni between them a comlnistion chamber irom which the hot gases flow in opposite directions and traverse the heating surfaces olI the respective units. lt is preferred that the units should be inclined towards each other thereby forming an A-shaped combustion chan'iber. The units are suspended from beams which are supported by a metal frame enclosing but not connected to the brick walls ot' the setting, as described and claimed in Letters Patent No. 1,159,051, `granted Noveml'ier 2, 1915. In suspending the units the upper drums 1 are so connected to the supporting beam G which as before stated is carried by the steel frame that the units may move freely under changes ot temperature. The suspending elements may be constructed and arranged if the boiler has a relatively small normal rating per unit, as shown and described in Letters Patent No. 1,238,530, dated August 2S, 1917, or il the boiler consists oi larger units it is preferred that the upper drums have a pivotal connection to the supporting beams as shown herein in Figs. 1 and 2.

In order to ensure uniform level of water in the units, the upper drums 1 are connected by a plurality of pipes 13, the points ot' connection of said pipes with the drums being by preference closely adjacent to the outer tubes c oi' the inner banks 3. These connectingpipes 13 serve to support refractory blocks 14 which close the space between the drums 1 and form what may be termed the conibustion chamber as shown in Figs. l and Q.

At suitable distances between the lower drums 2, fiat arches 15 project inwardly from the side walls 16 of the fire box, and bridge walls 17 extend up from the inner edges of these arches to a horizontal plane intersecting the lower drums closely adjacent to the points of connection of the outertubes a of the banks 3, with the drums. Provision is made for so connecting the tiles or blocks forming the arches 15 and bridge walls 17 to the metal frame enclosingthe brick work, as to permit of the easy and quick removal or renewal oi such blocks or tiles as shown in Figs. 2a, 3` 4 and 5. Beams 1S and 19 have their ends suitably secured to horizontal gil-ders 2() having their ends secured to vert ical members Q0, said girders and vertical members vforming parts ot' the enclosing metal frame. The beams 18 and 19 extend ing horizontally from one side ot' the frame to the other below the lower drum as shown in Figs. 1 and 3. On each of these beams are secured angle bars 21 for engagement by hooks 22 on trames 23 and 24 having the edges opposite those provided with the hooks Tshaped in cross section for engagement with correspondingly shaped grooves in the faces ot' the blocks and tiles forming the bridge walls as shown in Figs. 3 and 8. It will be observed that the beams 18 and 19 are so located and the tile supporting frames so constructed that when the frames are hung on the beams, the upper frame 23 will be at such a distance from the lower drum that the tiles may be easily placed on and reinoved troni the frames. The tiles torniing the flat arch are supported by -beains 25, said tiles having T-sbaped grooves in their upper ends tor the reception ot the lower tlange ot the beains Q5. The inner ends ot 'the beains 25 are `supported by the trames 24: which are provided et their lower outer corners with ledges 26 adapted to project under the upper flange 27 ot the beains 25 as shown in Figs. 3 and 7. The outer ends ol these benn'is are notched :tor the reception of one ot' the sides of angles 28 riveted to horizontal beains 29 which have their ends secured to tbe coluinns 20" "torininl portions of the enclosing metal freine.

y By retercnce'to Figs. 1 2*" and 5) if. will be seentbat the upper ineinber ofthe girder 2() is orined by `an -beani 32 thereby increasing the strength ol the girder as n uin.;t compressive strains, such strengthening; being necessary assuch portion oitlie `Qiriiler is employed in holding the lower drums spready apart the desired distance.

In order to hold the lower druins spaced `the desired distance apart, linee pieces 250 ure.

secured yto the upper portions ot the girders 2O, which vserve as almtn'ients ior'tlie angle pieces 31 secued to therends oi'' kthe drunri as shown in Figs. 5 and 9. The units being pivotally suspended troni the beams ti and the `center of gravity oi' the units beingoutsideof the pivotal pointsywhen their lower druins Aare properly spaced7 the portions et' the girders intermediate, tbe knees or abut- `inents 30 willbe subjected to severe coni pressive strains, whenlarge units are einployed and "charged `with water; Hence it isfjdesirabletoreinforce 'the portions oi' the girdersdirectly:subjected to such strains as hereinbetore stated.V v

'The top of the heatingchainber is toi-ined inpart by the tiles lllv interniediate the upper `drums and carried by tubes 13 as hereinbetore describeCLand over the rearpasses and outside of the drunis by tiles 35? which are supported by bars arranged intermediate the. outlets 3l to the stack and the resine-c,- tive drums l. ltwill be observed hat l hef-:e tiles abut against the drui'ns alturer a line closely adjacent to the points where the outer tribes ot the bank 45 eiitcr the upper dif-urns. I

As is well` known7 the heat'absorbing ei:- liciency ol". the elements oi" a boiler is dependent upon the relation otits surface to the voluine of waterltherein'and varies inversely with its ditnneter, and hence in boilers`ot`t'he type shown herein the heat absorption "origins cooling eliiciency oi the vdrains .is practically.. nil as cornpnred with the 'eiliciencyofthe tube/1f. It has tlieretore been one oitb'e objects in designingl the installition shown `and described herein to educe nneliicient lient absorbing' surtm ys such as the 'drums andthe 'walls bt the .se-.i-

tingand to coniine the flow ot hot grise.; to areas occupied by the tubes.

As shown in Fig. 6 the generating units each may consist of a pair ot upper drunis l, l, and a pair ot lower druins 2.` 2, and banks ot connecting tubes 3, fl, and 5, and 3a, la, and 5u. The additional i'i'ieinbers ot the units consisting of drinnel l?. fr?, and connecting banks ot' tubes 3"', Ll, 5, are pivot ally supported from beams l carried by the nietal traine in the saine nijanner as shown in Figs. l' `and Q. YVlicn using;l the `udditional .nieinbers the drunis i and 2 are connected respectively to the drums ll and by tubeiy 35 at points above the water level in saidr drums and the druins ll and 2* are ffii with the f lteain ot' the pair inay be connected to the lower drinn 2ans shown at the lett in; Fig. (i.

l `claini herein as niy invention: y

l. A boiler installation buying in combi nation a inetal traine, a setting encloiaied by tbe tranie, two generating munite.. each con sisting' oit upper and lower drums and con neeting tubcs,pivotally suspendedfrom the traine, and'nieans carried by the ii'rziziue for holding the lower drums in such position.; that the axes oit' the lower drunis will be outside ot vertical planes coincident with the axes ofthe upper druins Q. Ar'boiler installation having; in combination a inetal traine7 a setting enclosed by tliefranie, twoA heating units each consifting,` ot upper and lower drunis and `crmncctingrv tubes, so arranged within the setting; as te forni'between'thein n coi'nbustion cliainliier,

arches extending into the coni'busticn eliminber, bridge walls larr-anged ubore the niches., beains'hnving their ends Vconnected to 'the nietal traine, and ineen-.s carried by the beanis l'or suji'uiortinnl the tiles or blocks 'tornnng the arches and bridge wells.

3. A; boiler installation comprising' in combination a.Q'enerating;l unit including` uomy band.

GEORGE 'Bln/lllD.

lilii 

